Also possible that an injector or 2 are not firing (or mis-firing). Trick is to check the factory crimps in the wire harness about 10" up from where the harness is bundled on the engine side. These have been known to cause issues, and soldering the corroded wires fixes it. Been covered here before, and there are pics somewhere. Originally posted by Esquire.
Anyone know what happened to Darin? Been a long time since he's posted here.

85 4Runner - With NEW Marlin 4.7 Gears!! It's a whole new beast!